Pressure-filter.



E. J. SWEETLAND.

PRESSURE FILTER.

APPLIUATIOK FILED MAB.19,1912.

153w} D Patented July 9, 1912.

2 SHEETS-SHEET 1.

B. J. SWEETLAND.

PRESSURE FILTER.

APPLICATION FILED MARJQ, 1912.

Patented July 9, 1912.

Z SHEETS-SHEET 2.

rr era nnict 's' WEETLW NEW JERSEY.

PRESSURE-FILTER. a

osaoei.

' Application filed March 19 f To all whom it may concern:

Be it known that I, ERNEST J, SWEETLAND,

a citizen of the United States, residing at amount of labor.

Montclair. New Jersey, have invepted new and useful Improvements in Pressure-Fil- A further object is to provide a filter i wherein the filter cloth 'or other filtering medium may be washed without opening or separating the several parts of the machine.

Another object is to provide'a filter wherep in the residual component or cake can be conveniently removed from the filter surfaces by sluioing with water; or the cake may be dislodged from the filter surfaces and discharged in its natural condition without the addition of water, as may be preferred by the operator.

Another object is to provide a filter where.- in all the parts are easily accessible for repair or renewal.

Another object is to provide a filter wherein the several filtering members are individually controllable from the outside of the machine, and any one may be shut ofi at will in theevent of a tear occurring in the filter cloth. I

Another object is to provide a filter wherein a space is provided in the bottom of the filter body to facilitate flushing out the 1 residues, but so constructed that the filter body may be inverted if desired, bringing this void space to the top, so that the surplus liquid may be forced out through the filter cloth. Another advantage gained by inverting the filter is that the interior of the filter members are then drained by gravity.

. Another object is to provide a filter wherein the filtered liquid issuing from each filtering member is separately visible to the operator so that it any one of the members. should become defective by clogging, or by a tearin the cloth, the imperfection'will be indicated by the appearance of the liquid passing through the transparent delivery tubes.

While it is the object of this invention to perforrmthe service now performed by the ordinary filter press of sectional construction it is radically different from these filter presses in that it dispenses entirely with the- Speciflcation of Parr are L tt rs Pat nt. Patented. July 9, 1912.

, 1912. Serial No. 684,873.

use of frames or containers and their attendant disadvantage s.

It is well known that in plate and frame filter presses of the ordinary type wherein the filter cloth is clamped between the sections, there is considerable leakage, and the filter cloth is mechanically injured by being squeezed between the sections.

It is one of the objects of my invention to overcome these objections; I

The construction will be understood by those skilled in the art byreference to the accompanying drawings whereinlike characters refer to similar parts in all the figures.

end elevation of the assembled machine. Fig. 2 is, aside elevation with a portion broken away to show the interior construction. Fig. 3 shows one of the filter members removed with a section of the filter cloth laid open to show the screen within. Fig. 4 is a horizontal sectional View of Fig. 3 on the center line looking downward. Fig. 5 is a sectional View showing the means of attaphing the filter members to the filter body. Fig. 6 shows-an end elevation of the assembled machineopened for dry discharging of residues or for repairs tothe interior, the standard 4 being omitted to better show the parts. Fig. 7 shows the filter body inverted by having been turned through an arc of 180 degrees on its axis. Fig. 8 shows a modifiedform of filter device wherein the filter cloth is stitched in radial seams and held apart by corrugated plates. Fig. 9 shows a corrugated plate for a filter device of the type shown in Fig. 8. Fig. 10 is a section of Fig. 9 on the linear-b.

Referring to the parts: 1 is the upper portion of the filter body to which the lower portion 2 is attached by means of the hinge 3, the whole being supported on the standards 4: and A by'means of the trunnions 18 and 18. which are attached to the upper portion 1. The lugs 5 are provided with eye.-

lower portions in close union with each other forming a water tight chamber with a gasket between the two portions. A conduit or passageway 8 runs along the side of 1. A plurality-of hollow projections 9 are located along thev top of the filter body and a pipe 11, elbowilii and lass tube 15 form a passageway for the fi l tered liquid from the filter members to the conduit. I

12 is a valve and 1t and 1d are suitable Referring to the drawings; Figure l is an bolts 6 and nuts 7 which hold the upper and J fittings to connect the glass tube to the pipe fittings.

A sluicing pipe 16 passes through a stuffing box 17 and runs. through the entire length of the filter body on the longitudinal axis thereof. This pipe is provided witha plurality of holes or nozzles through which a fluid may be projected against the filter devices 19 for the purpose of cleaning. 18 and 18 are trunnions upon which the whole filter body rests in bearings at the top of 4; and 4. These trunnions are hollow, and the sluicing'pipe passes through 18 and its end terminates in 18 which is closed at the outer end. The inner end of the sluicing pipe is closed so that any fiuid forced through it must pass through the openings 35.

When it is desired to remove any of the filter devices, the lower section 2 of the casing is swung open on its hinges as shown in Fig. 7, and the sluicing pipe removed, when anyfilter device may be taken out by un-..

screwing the cap 10.

The filter device 19 comprises a circular frame made of pipe 20 with holes 21 on its inner periphery. A screen or grating 23 formsa web on the interior of the frame. A hole 27 is formed in this web. A nipple 24 connects with the perforated ipe and this nipple has a side outlet 25 which alines with ipe 11 in the'assembled machine. The shoulder 26 and gasket 26" form a sealed jbint between the filter device and the outer the outside.

casing, and the gasket 10 between the cap 10 and the projection 9 prevents leakage to The entire filter device is covered With'cloth, canvas or other fabric on pressure bothsides, and the edges of the cloth 22 are sewed together all around the peripheryand likewise around the edges of the\ central hole 27, so that any liquid which issues from the optlfit25 must first have passed through the c 0t In the modified filter device shown in Fig. 8, the parts are similar to those of Fig. 3 except that corrugated plates 41 are used instead of screen or grating, and the two lay- ,ers of cloth are stitched together in radial lines 39 to hold the plates 41 in place and prevent ndue bulging of the bags when it applied to the interior. One of the'plates is shown in elevation in Fig. 9,

U and 1n section in Fig. 10.

5 The three-wayvalve, 28 serves as inlet for the filter body through the flexible hose 30 and as outlet through the larger passage; way 29.

31 is a pipe connectedwith conduit 8.

33 is a side qonnection, and 32 and 34 are valves. f I

36 is a pipe connectionand 37 is a nozzle directed along the bottom of the filter casing.

' 40 is a sloping drainage channel'terminht ing at the outlet passage.

As, the entire filter body and its attendant parts is invertible, the parts which are upper in the'normal position become lower in the reversed position, therefore to avoid confusion be it understood that wherever the terms upper, lower, etc., are used throughout this specification and in the claims, reference is made to the location of the parts when the filte'r body is in its normal position as shown in Fig. 1.

Operation.

The liquid to be filtered is forced into the filter body through the hose 30 and valve 28 until the entirefilter body is filled and the filter devices submerged. During the filling the air may escape throughany convenlentopening at the top of the filter body or through the filter clot-h- Assoon as the filter body is filled. filtration commences, the liquid passing through the filter cloth flows through the spaces on the inside of thcfilter device through the perforations 21 into pipe 20 whence it flows through the fittings into the conduit 8, from which it issues through'pipe 31 and valve 32 into any desired receptacle. As filtration continues the solid or semi-solid matter which will not pass through the filter cloth is deposited upon the wal'ls of said cloth, forming a cake of residue which gradually increases in thickness as filtration progresses. This cake in practice usually contains soluble matter of value which has to be removed by washing, or displacement. To accomplish this object suction is applied to pipe 31which prevents the cake falling ofi when relieved of external pressure. The surplus unfiltered liquid surrounding the cakes is then withdrawn through 29 and water forced. into the filter body under pressure, whichpercolates through the residues adhering to the cloths and washes out Oleam'mg or discharging.

Wet mcth0d.-If. it is desired to sluice the residual cake from the filter body, this may be done by opening valve 28 toward outlet 29 and forcing a liquid under pressure through the sluicing pipe 16 and slowly revolving same by means of the crank 16*. The liquid issues in forcible jets through the-openings or nozzles 35 and flushes the residues oil. the filter devices; the mixed residues and sluicing liquid flows out through 29. -While this is in progress a stream is also projected from nozzle 37 which assists in flushing the accumulated solids out of the filter body. If desired, while sluicing is in progress, valve 32 may .{be closed and steam or compressed a inturned passage 25 into pipe 11, through the various- In some cases I may clean the' filter surfaces by partially filling the filter chamber with water, or with any suitable solvent and rotate the filter on its axis, whereby the cleansing action of the Water or solvent Will be enhanced by its motion over the filter sin-faces.

1)l l/ discharging-If it is desired to recover the cakes without disintegrating them the sl-uicing pipe maybe left out entirely and inserted only at such times as it isdesired to wash the cloths. To discharge the cakes Without sluicing it is necessary only to open the filter body as shown in Fig. (3, holding the cakes in place with vacuum until ready, and then admit compressed air through the pipe 31 which disengages the cakes from the filter devices and causes them to fall into any desired receptacle below. For this method of operating the type of filterdevice shown in Fig. 8 is preferable as the stitching preyents undue bulging of the cloth when compressed air enters the interior.

Filtering with filter imerted.

tains unfiltered liquid that has to be withdrawn, While if the filter body is inverted this space is at the top and all the liquidmay be forced out through the cloths by compressed-air, lcaying no surplus to be withdrawn, and leaving the cakes practically dry.

I do not limit my invention to the specific construction described, nor dolt limit myself to cloth as a filter medium. for the same principle may be employed with any form of filter plate. a

What I claim as my invention 1s:

1. In a filter device comprising a peripheral frame with an outlet passage, filter cloth surrounding the frame and secured at the edges, a separator Within the frame covered by the cloth, said filter device provided with a central aperture forming an open passageway therethrough, and the cloth secured together around the aperture, radial rows of stitching uliiting the filter at in tervals. g

2. A filter comprising a cylindrical filter easing with a plurality of filter plates detachably secured within the casing, each plate having a delivery tube extending through the casing .and secured thereto by means of a device on the outside of the easing, a conduit on the outside of the casing for the drainage of filtered liquid, a tube leading from each filter plate to the conduit, a valve on each of said tubes, a hinged door on the lower side of the casing, an auxiliary passageway through the door.

3. A filter comprising a cylindrical filter casing with a plurality of filter plates detachably secured within the casing, each plate having a delivery tube extending through the casing and secured thereto by means of a device on the outside of the easing, a conduit on the outside of the casing for the drainage of filtered liquid, a tube leading fromeach filter plate to the, conduit, a Valve on each of said tubes, :1. portion of each tube made of transparent material 4. A filter comprising a cylindrical filter casing, a plurality of filter plates attached Within and removable from said casing, a

hinged door attached to the filter casing and extending the full length thereof, said door provided with an auxiliary aperture for the entrance or exit of liquid, the filter plates extending below the joint between the filter casing and the door, a conduit on" the filter casing and a tube and valve connecting each filter plate with the conduit. 5. A. filter comprising a plurality of filter bags, a supporting structure within each bag, each bag provided with an aperture, the cloth on opposite sides of each bag joined together around the aperture and joined togetherat theouter edges to completely inclose the supporting structure, the cloth on both sides of the bags supported at intervals to resist internal pressure, the

said aperturesregistering to form an unobstructed passageway through the series of bags, a rotatable pipepassing through the apertures, outlets in said pipe adapted to project streams of a cleansing fluid on the surfaces of the bags.

6 A filter comprising a plurality of filter bags, at supporting structure Within each bag, each bagprovided with a central aperture, the cloth on the opposite sides of each bag joined together around the aperture, the outer edges of each bag sewn together to completely inclose the supporting structure within the bag, the cloth on both sides of the bag supported at intervals to resist internal pressure, an outlet pipe leading from the interior of each bag, the central apertures alining to form a continuous passageway through the series of bags, a rotatable pipe extending through said; passageway, nozzles egg on the pipe adapted to project a'cleansing fluid on the surfaces of the bags.

7. A filter comprising a plurality of flat circular filter bags, a supporting structure inclosed in each bag, each bag provided with a central aperture, the cloth on opposite sides of each bag joined together around the central aperture, peripheral stitching uniting the outer edges of each bag to completely inclose the supporting structure I within the bag, means of supporting the sides of the bag to prevent bulging when subjected to internal pressure, an outlet pipe communicating with the interior of each bag, the central apertures alining to form a continuous passageway through the series of bags, a rotatable pipe extending through said passageway and adapted to project a cleansing fluid on the surfaces of the bags.

2 8. A filter comprising a plurality of fiat circular filter bags, a supporting structure inclcsed in each bag, each bag provided with a central aperture, the cloth on opposite sides of each bag joined together around the central aperture, peripheral stitching uniting the outer edges of each bag to completely inclose the supporting structure Within the bag, means of supporting the sides of the bag to prevent bulging. when subjected to internal pressure, an outlet pipe communicating with the interior of each bag, the central apertures alining to form a continuous passageway through the series of bags, a rotav table pipeextending through said passageinoaaoei way and adapted to project a cleansing fluid I the outer edges of each bag to completely inclose the supporting structure within the bag, means of supporting the sidesiot the bag to preventbulging when subjected to internal pressure, an outlet pipe communieating with the interior of each bag, the central apertures alining to form a continuous passageway through the series of bags, a rotatablepipe extending through said'passageway and adapted to project a cleansing fluid on the surfaces of the bags, a

casing surrounding the entire series of bags with the outlet pipes passing through said casing, a drainage channel in the bottom of the casing for drainage of material washed from the bags. v

In testimony whereof I have signed my name in the presence of two subscribing witnesses.

nnnnsr swnnrtann.

Witnesses a a ARTHUR WRIGHT, Rosana: B. Howie, 

